Following on from John Wakefield's recent request for info in support of members queries on Villiers carb applications (in the 'Road machines' sub-forum), I can add the following;
For our purposes here, the new Carrick/Walker book 'Villiers-Everybody's Engine' (ISBN 978-0-9555278-4-5) contains pretty much the same info re carbs as the earlier Roy Bacon book, 'Villiers Singles and Twins' (ISBN 1-85579-020-3.)
However, the clearest (and best!) explanation on this topic I have ever seen was written by Peter Rotherham in 'Leading Link'#81, and I will relay the important bits here, as Peter doesn't mind me doing so. I will cover the relevant info for Villiers 'S' type carbs but not Amal units, which Peter including in his comprehensive and informative article. (Thanks Peter, extremely useful info as always. Please do chip in if I've missed anything important!)
Twin cylinder machines used the S.22 unit, recognisable by the ridges on the float chamber.
Singles (9E, 32A) mostly used the S.25 unit. On the fuel tickler side of the carb body will be a small raised lug with the definition/type of that particular carb stamped on it, depending on final usage/application.
S.25 or blank (no stamping) Standard carb body; Spare/replacement.
S.25/1 Standard carb body, no strangler, but seperate cable operated strangler fitted for Bond cars and 9E; 9E and 32A.
S.25/2 Standard carb body with strangler and rod operation; 32A and 37A.
S.25/3 Standard carb body with strangler and cable operation; 3T and road bikes.
S.25/4 Unknown details.
S.25/5 Choke bored to 1", no strangler; 2H and 32A.
S.25/6 Choke bored to 1", with strangler, rod operation; 32A and Starmaker.
S.25/7 Standard carb body with throttle stop; Bond and road bikes.
S.25/8 Standard carb body with strangler, cable operation and throttle stop; Bond and road bikes.
Another excellent source of info on carb specs and their variation/application is of course the relevant Villiers handbooks. Originals (or copies) of these are available from Villiers Services (01384 265797.) The ones I have (for my own bike-32A) cover the singles and include excellent drawings of all parts (including carbs) for reference, as well as further details on variations and applications;
Competition and Road-Vehicle Engines Maintenance Manual (V.E.C. 161)
(Covers; Mark 31C, 2CL, 3L, 9E, 10E, 11E, 31A, 32A, 33A, 34A, 35A, 36A, 37A.)
Competition and Road-Vehicle Engines Replacement Parts Manual (V.E.C. 545)
(Covers; Mark 31C, 2CL, 3L, 9E, 10E, 11E, 31A, 32A, 33A, 34A, 35A, 36A, 37A.)
Hope this helps,
Brian.
For our purposes here, the new Carrick/Walker book 'Villiers-Everybody's Engine' (ISBN 978-0-9555278-4-5) contains pretty much the same info re carbs as the earlier Roy Bacon book, 'Villiers Singles and Twins' (ISBN 1-85579-020-3.)
However, the clearest (and best!) explanation on this topic I have ever seen was written by Peter Rotherham in 'Leading Link'#81, and I will relay the important bits here, as Peter doesn't mind me doing so. I will cover the relevant info for Villiers 'S' type carbs but not Amal units, which Peter including in his comprehensive and informative article. (Thanks Peter, extremely useful info as always. Please do chip in if I've missed anything important!)
Twin cylinder machines used the S.22 unit, recognisable by the ridges on the float chamber.
Singles (9E, 32A) mostly used the S.25 unit. On the fuel tickler side of the carb body will be a small raised lug with the definition/type of that particular carb stamped on it, depending on final usage/application.
S.25 or blank (no stamping) Standard carb body; Spare/replacement.
S.25/1 Standard carb body, no strangler, but seperate cable operated strangler fitted for Bond cars and 9E; 9E and 32A.
S.25/2 Standard carb body with strangler and rod operation; 32A and 37A.
S.25/3 Standard carb body with strangler and cable operation; 3T and road bikes.
S.25/4 Unknown details.
S.25/5 Choke bored to 1", no strangler; 2H and 32A.
S.25/6 Choke bored to 1", with strangler, rod operation; 32A and Starmaker.
S.25/7 Standard carb body with throttle stop; Bond and road bikes.
S.25/8 Standard carb body with strangler, cable operation and throttle stop; Bond and road bikes.
Another excellent source of info on carb specs and their variation/application is of course the relevant Villiers handbooks. Originals (or copies) of these are available from Villiers Services (01384 265797.) The ones I have (for my own bike-32A) cover the singles and include excellent drawings of all parts (including carbs) for reference, as well as further details on variations and applications;
Competition and Road-Vehicle Engines Maintenance Manual (V.E.C. 161)
(Covers; Mark 31C, 2CL, 3L, 9E, 10E, 11E, 31A, 32A, 33A, 34A, 35A, 36A, 37A.)
Competition and Road-Vehicle Engines Replacement Parts Manual (V.E.C. 545)
(Covers; Mark 31C, 2CL, 3L, 9E, 10E, 11E, 31A, 32A, 33A, 34A, 35A, 36A, 37A.)
Hope this helps,
Brian.
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